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1 efrain 1 
<?php
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namespace Aws\Signature;
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/**
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 * Provides signature calculation for SignatureV4.
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 */
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trait SignatureTrait
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{
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    /** @var array Cache of previously signed values */
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    private $cache = [];
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    /** @var int Size of the hash cache */
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    private $cacheSize = 0;
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    private function createScope($shortDate, $region, $service)
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    {
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        return "$shortDate/$region/$service/aws4_request";
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    }
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    private function getSigningKey($shortDate, $region, $service, $secretKey)
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    {
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        $k = $shortDate . '_' . $region . '_' . $service . '_' . $secretKey;
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        if (!isset($this->cache[$k])) {
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            // Clear the cache when it reaches 50 entries
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            if (++$this->cacheSize > 50) {
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                $this->cache = [];
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                $this->cacheSize = 0;
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            }
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            $dateKey = hash_hmac(
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                'sha256',
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                $shortDate,
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                "AWS4{$secretKey}",
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                true
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            );
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            $regionKey = hash_hmac('sha256', $region, $dateKey, true);
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            $serviceKey = hash_hmac('sha256', $service, $regionKey, true);
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            $this->cache[$k] = hash_hmac(
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                'sha256',
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                'aws4_request',
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                $serviceKey,
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                true
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            );
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        }
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        return $this->cache[$k];
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    }
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}